diff --git a/content/html/content/src/HTMLOutputElement.cpp b/content/html/content/src/HTMLOutputElement.cpp
index cf5f4116aab8..fd5465fd2fba 100644
--- a/content/html/content/src/HTMLOutputElement.cpp
+++ b/content/html/content/src/HTMLOutputElement.cpp
@@ -5,12 +5,13 @@
 
 #include "mozilla/dom/HTMLOutputElement.h"
 
-#include "mozilla/dom/HTMLOutputElementBinding.h"
-#include "nsFormSubmission.h"
-#include "nsDOMSettableTokenList.h"
-#include "nsEventStates.h"
 #include "mozAutoDocUpdate.h"
 #include "mozilla/dom/HTMLFormElement.h"
+#include "mozilla/dom/HTMLOutputElementBinding.h"
+#include "nsContentUtils.h"
+#include "nsDOMSettableTokenList.h"
+#include "nsEventStates.h"
+#include "nsFormSubmission.h"
 
 NS_IMPL_NS_NEW_HTML_ELEMENT(Output)
 
@@ -140,6 +141,12 @@ HTMLOutputElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
   return rv;
 }
 
+void
+HTMLOutputElement::GetValue(nsAString& aValue)
+{
+  nsContentUtils::GetNodeTextContent(this, true, aValue);
+}
+
 void
 HTMLOutputElement::SetValue(const nsAString& aValue, ErrorResult& aRv)
 {
diff --git a/content/html/content/src/HTMLOutputElement.h b/content/html/content/src/HTMLOutputElement.h
index fa7bb7e655b0..ced83667b928 100644
--- a/content/html/content/src/HTMLOutputElement.h
+++ b/content/html/content/src/HTMLOutputElement.h
@@ -86,11 +86,7 @@ public:
 
   void SetDefaultValue(const nsAString& aDefaultValue, ErrorResult& aRv);
 
-  void GetValue(nsAString& aValue)
-  {
-    nsContentUtils::GetNodeTextContent(this, true, aValue);
-  }
-
+  void GetValue(nsAString& aValue);
   void SetValue(const nsAString& aValue, ErrorResult& aRv);
 
   // nsIConstraintValidation::WillValidate is fine.